Si-Hyun PARK^* and Heonsu JEON¹

Department of Photonic Engineering, Chosun University, Gwangju 501-759, Korea
¹School of Physics, Seoul National University, Seoul 151-747, Korea

(Received September 15, 2005; Accepted November 29, 2005)

We fabricated microchip-type InGaN vertical external-cavity surface-emitting lasers (VECSELs) integrated with microlenses and investigated their operational properties using an optical pumping method. We confirmed that the multimode lasing operation is consistent with a given VECSEL structure and that there is an optimized curvature radius in terms of the threshold input energy, slope efficiency, and mode stabilization. A simple theory using the Gaussian beam mode provides an excellent explanation of VECSEL lasing properties and the effect of the microlens on lasing.

Key words: vertical external cavity surface emitting laser, microchip, microlens, mode stabilization, Gaussian beam mode

^*Corresponding author. E-mail address: sihyun_park@chosun.ac.kr